I think the HoFs among the 90s / 00s pitchers would have been the first ones to have the surgery widely available early enough in their careers to pile up HoF credentials. That would be the starters (Pedro, the 3 Braves, Mussina, Randy Johnson, CC, maybe some others that don't immediately come to mind), and the relievers (Mo, Lee Smith, Wagner, Eck who is a little earlier). That's something like 11 of the 22. There's probably some Negro League and veterans committee types too (Don Sutton?) who more or less pitched before TJS. Beyond that, the Hall was a little light on electing HoF pitchers and for the most part the surgery wasn't available. Ryan waited until his last pitch to blow out his UCL. Seaver was another horse.
The guy for me who was a "what if" is Frank Tanana. He began to throw soft when he had elbow issues. IDK if his tendon was damaged, but with modern techniques I think he may have gotten a brace and still been able to throw hard.